Menstrual Cup
A menstrual cup for use in a vagina. The cup includes a receptacle extending from an open top end to a closed bottom end and a stem attached to the receptacle at the bottom end thereof for use in removal of the cup. The receptacle comprises a wall having an inner wall surface defining a cavity adapted for collecting fluid and an opposed outer wall surface. The open top end has a predetermined diameter, the receptacle being adapted to be flexible and resilient. The outer wall surface includes an upper rim at the top end of the receptacle for strengthening the top end, a main portion extending from the bottom end of the receptacle portion towards the top end, and a transition portion between the main portion and the upper rim, the transition portion being streamlined to define a profile thereof which is substantially smooth.
This invention is related to menstrual cups.
BACKGROUND OF THE INVENTIONMenstrual cups are known, and various cups are disclosed in U.S. Pat. Nos. 1,891,761 (Goddard), 1,996,242 (Hagedom), 2,089,113 (Chalmers), Des. 323,212 (Crawford), and 5,827,248 (Crawford).
However, known menstrual cups have a number of disadvantages. For instance, a typical cup includes a relatively sharply defined ridge positioned generally in the vicinity of an upper end thereof, which tends to interfere with the removal of the cup. Although this relatively sharp ridge may assist in holding the cup in place, the ridge tends to interfere with removal of the cup, thereby sometimes causing discomfort. Also, known cups can include a plurality of holes disposed proximal to the ridge, to equalize air pressure inside and outside the cup when it is inserted and when it is removed, thereby facilitating insertion and removal. In addition, the known cups generally lack convenient and easily gripped portions at the bottom ends thereof, to facilitate removal. Finally, known cups are usually made of a thermoplastic such as polyethylene which, although suitably flexible and resilient, cannot be boiled for sterilization thereof. Alternatively, known cups may be made of natural latex rubber, however, this material has the disadvantage that many users are severely allergic to it.
Therefore, there is a need for an improved menstrual cup which overcomes one or more of the disadvantages of the prior art.
SUMMARY OF THE INVENTIONIn its broad aspect, the invention provides a menstrual cup for use in a vagina. The cup includes a receptacle extending from an open top end to a closed bottom end and a stem attached to the receptacle at the bottom end thereof, for use in removal of the cup. The receptacle includes a wall having an inner wall surface defining a cavity adapted for collecting fluid and an opposed outer wall surface. The open top end has a predetermined diameter, and the receptacle is adapted to be flexible and resilient. The wall comprises an upper rim portion at the top end of the receptacle for strengthening the top end, to maintain the cup in a preselected position in the vagina. Also, the wall comprises a transition portion extending-downwards from the rim portion towards the bottom end and a main portion extending from the transition portion to the bottom end of the receptacle portion. The transition portion is streamlined to define a profile which is substantially smooth.
In another aspect, the cup includes one or more ridges on the stein.
The invention additionally includes one or more receptacle ridges in the main portion of the outer wall surface.
In yet another aspect, the invention includes one or more volume markings on the inner wall surface, for indicating the volume of fluid collected in the cavity.
In yet another of its aspects, the invention additionally includes one or more holes, each hole extending from an inner end at the inner wall surface to an outer end at the outer wall surface to permit fluid communication between the inner wall surface and the outer wall surface when the cup is inserted in the vagina and removed therefrom, the inner end of each hole being positioned lower than the outer end.
In another aspect, the cup is made of silicone rubber.
BRIEF DESCRIPTION OF THE DRAWINGSThe invention will be better understood with reference to the drawings, in which:
Reference is first made to
The thickness of the cup wall 25, i.e. the distance between the inner wall surface 24 and the outer wall surface 28, varies from the upper rim portion 34 to the main portion 36, particularly in the transition portion 38 as best seen in
The cup 20 also includes a stem 40 which is attached to the receptacle 22 at the bottom end 32, for use in insertion and removal of the cup 20, as will be described. Preferably, the cup 20 includes one or more ridges 42 located on the stem 40 (
As shown in
In the preferred embodiment, the cup 20 also includes one or more holes 52 (
Preferably, the cup 20 comprises an elastomeric material, and the receptacle 22 and the stem 40 are integrally joined. The cup 20 is primarily formed in an injection mold, and it is therefore convenient, and expedient, to form the receptacle 22 and the stem 40 of the same material.
The preferred elastomeric material is an organosilicon oxide polymer, i.e., a silicone rubber. Silicone rubber is preferred because it rarely (if ever) causes skin irritation, and it has the necessary resiliency and durability. Also, silicone rubber can be placed in boiling water for sterilization without damaging the article. The silicone rubber is preferably a medical grade.
In use, the user folds the receptacle 22 lengthwise and inserts the cup 20 into the user's vagina, top end 30 first. Once inserted, the top end 30 returns to its usual size, i.e., the top end 30 returns to the predetermined diameter. The cup 20 preferably is positioned relatively low in the vagina so that the cup 20 may be easier to remove and to prevent leakage. When the user wishes to remove the cup 20, the user grasps the stem 40 and the bottom end 32, to pull the cup 20 out. The ridges 44 on the main portion 36 of the outer wall surface 28, and the ridges 42 on the stem 40, facilitate the removal of the cup 20 because the ridges 42, 44 make it easier for the user to grasp the cup 20. Because the stem 40 forms an integral unit with the receptacle 22, the stem 40 is not detachable. The stem 40 is preferably hollow, so that it is relatively flexible, and less likely to cause discomfort to the user when the cup 20 is inserted.
As shown in
It therefore can be seen that the transition portion 38, having a streamlined profile, permits a relatively easy as well as comfortable removal of the cup 20, while the intersection of the transition portion 38 with the upper rim portion 34 provides a small recessed region in which the outer ends 56 of the holes 52 may desirably be located.
It will be appreciated by those skilled in the art that the invention can take many forms, and that such forms are within the scope of the invention as claimed. Therefore, the spirit and scope of the appended claims should not be limited to the descriptions of the preferred versions contained herein.
Claims
1. A menstrual cup for use in a vagina, the cup comprising:
- a receptacle comprising a wall having an inner wall surface defining a cavity adapted for collecting fluid and an opposed outer wall surface, the receptacle extending from an open top end to a closed bottom end, the open top end having a predetermined diameter, the receptacle being adapted to be flexible and resilient, the wall comprising an upper rim portion at the top end of the receptacle for strengthening the top end and to maintain the cup in a pre-selected position in the vagina, a transition portion extending downwards from the upper rim portion, the transition portion being streamlined to define a profile thereof which is substantially smooth, and a main portion extending downwards from the transition portion to the closed bottom end of the receptacle.
2. NA menstrual cup according to claim 1, wherein the thickness of the wall decreases from the upper rim portion to the transition portion and from the transition portion to the main portion.
3. A menstrual cup according to claim 1, wherein the thickness of the wall in the transition portion is tapered from the upper rim portion to the main portion.
4. A menstrual cup according to claim 1, additionally including a stern attached to the receptacle at the bottom end thereof, for use in removal of the cup.
5. A menstrual cup according to claim 4, additionally including at least one ridge on the stem.
6. A menstrual cup according to claim 1, additionally including at least one receptacle ridge in the main portion of the wall.
7. A menstrual cup according to claim 1 additionally including at least one volume marking on the inner wall surface, for indicating the volume of fluid collected in the cavity.
8. A menstrual cup according to claim 1, additionally including at least one volume marking on the outer wall surface, for indicating the volume of fluid collected in the cavity.
9. A menstrual cup according to claim 1, additionally including at least one hole extending from an inner end at the inner wall surface to an outer end at the outer wall surface to permit fluid communication between the inner wall surface and the outer wall surface as the cup is inserted in the vagina and removed therefrom, the inner end being positioned lower than the outer end.
10. A menstrual cup according to claim 1 comprising an elastomeric material.
11. A menstrual cup according to claim 10 in which the elastomeric material is a silicone rubber.
Type: Application
Filed: Sep 22, 2005
Publication Date: Mar 27, 2008
Applicant: Diva International Inc. (Kitchener, ON)
Inventors: Carinne Chambers (Kitchener), Francine Chambers (Kitchener)
Application Number: 11/663,470
International Classification: A61F 5/451 (20060101);